Valve-facing tool



Nov. 19, 1929. H. A. BERKMAN VALVE FACING TOOL Filed Dec. 15 192'? 727/9250 #Mw/ 4W,

l atented Nov. 19, 1929 r UNITED STATES PATENT OFFICE v HERBERT A. BERKMAN, OF CHICAGG, ILLENGIS, ASSIGNOR TO ZIM MANUFACTURING COMPANY, A CGRPGRATION OF ILLINOIS VALVE-FACING TOOL Application filed December 15, 1927. Serial No. 240,142.

after he pointed out with particularity in the claim; but, for a full understanding of my invention and of its objects and advantages, reference may be had to the following detailed description taken in connection with the accompanying drawing, wherein:

in the device; Fig. 3

Figure 1 is a side view of a device embodying my invention in a preferred form; Fig. 2 is a section taken on line 22 of Fig. 1., showing in dotted lines a va ve being inserted is a view similar to showing the tool in cutting relation at is a top plan view Fig. 2,

to the valve; and Pi of the device.

Referring to the drawing, 1 represents a cylindrical cup-shaped member he ing a central downwardly projec ing stem 2. ll ings 3, 3 extending radially of the cup from opposite sides of the stem and joined to the bottom of the cup, are preferably provided to stiffen the structure. The cup, with the stem and stiffening wings, preferably comprises a single integral casting. Around the mouth of the cu nthat is constitut' 1g the upper annular edge, is a face 4 in the form of an 5 inverted frustum of a cone; the angle of the cone corresponding to the angle of the valve face to be reamed. There is a bore 5, coaxial with the conical surface, extending down through the bottom of the. cup and through 0 the stem; tiis bore being of approximately the same diameter as the stems of the valve to be operated upon; and thus serving as a guide. when a valve is inserted the device. The wall of the cup is thickened at one side 5 to produce a boss 6, lying partly within and partly without the cup. A non-circular hole 7 extends through the boss from bottom to top, at an angle to the vertical. A suitable cutting tool 8 is positioned in the hole in the boss, being conveniently held in place by means of a set screw 9. edge 10 of the tool lies parallel with the nearest element in the conical surface corresponding to the seat 4, but stands slightly above the same. This cutting edge is longer than the width of the conical face in the cup and preferably projects somewhat beyond the latter, both inwardly and outwardly. The top face of the tool, indicated at 11, slants back from the cutting edge, as is usual with cutting tools of this general type. v

When a valve, such as that shown at A in the drawing, is to be operated upon, its stem a is inserted through the guide opening 5 in the bottom of the cup and the stem far enough to permit the valve face to come to rest on the conical seat 4. The valve is then rotated, by means of a force applied to its stem, in a direction to permit the cutting edge of the tool to ream the valve face. If the valve stem has an opening extending through the same near the'lower end, a long pin, such as shown at B, may be insterted through this opening to form a handle by which the valve may be turned with one hand While the tool is held in the other hand.

It will be seen that the valve is accurately centered in the tool and, further, that the depth of cut may be nicely regulated since it depends on the distance that the'cutting edge projects above the conical surface. After the cutter has once been adjusted, it is impossible for it to dig into the valve face because the conical supporting seat prevents the valve from being drawn down; and therefore, since the cutter is rigidly held, it can at no time out into the valve face more deeply than the intended slight depth.

The diameter of the valve may vary, within limits, as long as the pitch of its face is the same as that of the conical seat in the tool, so that the use of the tool is not limited to valves of one diameter. The valve shown in the drawing is somewhat larger in diameter than the smallest valve that can be faced, and it will be seen that if a considerably larger valve is to be operated upon, it will simply set higher up in the cup.

It will thus be seen that I have produced a The cutting simple and novel valve facing device, consisting of a single casting, a cutter, and a screw for holding the cutter, by means of which the faces of valves may be quickly and accurately reamed by one not required to be a skilled mechanic.

While I have illustrated and described with particularity only a single preferred form of my invention, I do not desire to be limited to the exact structural details thus illustrated and described; but intend to cover all forms and arrangements which come within the definitions of my invention constituting the appended claim.

I claim A valve-facing device comprising a cup shaped member having a stem projecting downwardly from the bottom thereof, the

upper edge of the cup being in the form of an inverted frustum of a cone, there being a bore coaxlal with said cone extending through the bottom of said cup and throu 11 said stem said cua bein vrovided g 7 l a l on one side with-a boss, there being a hole open at the top and at the bottom extending through the boss and the adjacent side oi the cup, the hole intersecting said conical seat and having its long axis lying in a plane ap proximately parallel with the long axis of the device and making an acute angle with a radial plane, and a cutting tool positioned in said hole and havingat the upper end a cutting edge parallel with an element of the conical seat and lyings'lightly above the same. In testimony whereof, I signthis specification. on A HERBERT A. BERKMAN.

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